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Notocotylus Loeiensis N. Sp. (Trematoda: Notocotylidae) from Rattus Losea (Rodentia: Muridae) in Thailand Chaisiri K.*, Morand S.** & Ribas A.***

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Notocotylus Loeiensis N. Sp. (Trematoda: Notocotylidae) from Rattus Losea (Rodentia: Muridae) in Thailand Chaisiri K.*, Morand S.** & Ribas A.*** NOTOCOTYLUS LOEIENSIS N. SP. (TREMATODA: NOTOCOTYLIDAE) FROM RATTUS LOSEA (RODENTIA: MURIDAE) IN THAILAND CHAISIRI K.*, MORAND S.** & RIBAS A.*** Summary: Résumé : NOTOCOTYLUS LOEIENSIS N. SP. (TREMATODA : NOTOCOTYLIDAE) CHEZ RATTUS LOSEA (RODENTIA : MURIDAE) EN THAÏLANDE Notocotylus loeiensis n. sp. (Trematoda: Notocotylidae) is described from the cecum of the lesser rice field rat (Rattus losea), from Notocotylus loeiensis n. sp. (Trematoda : Notocotylidae) du caecum Loei Province in Thailand with a prevalence of 9.1 % (eight of 88 du petit rat des rizières (Rattus losea) a été observé chez huit rats rats infected). The new species differs from previously described sur 88 (9,1 %) dans la province de Loei en Thaïlande. Cette nouvelle Notocotylus species mainly by the extreme prebifurcal position of espèce diffère de celles de Notocotylus décrites précédemment, the genital pore and the number of ventral papillae. This is the first principalement par la position prébifurcale extrême du pore génital description at the species level of Notocotylus from mammals in et par le nombre de papilles ventrales. Il s’agit de la première Southeast Asia. description du niveau d’espèce Notocotylus chez un mammifère en Asie du Sud-Est. KEY WORDS: Notocotylus, Trematoda, Digenea, Notocotylidae, Rattus losea, lesser rice field rat, Thailand. MOTS-CLÉS : Notocotylus, Trematoda, Digenea, Notocotylidae, Rattus losea, petit rat des rizières, Thaïlande. INTRODUCTION Thi Le (1986) reported larval stages of Notocotylus intestinalis (Tubangui, 1932) from two species of fresh water gastropods (Alocinma longicornis and Parafos- he trematode genus Notocotylus is cosmopolitan, sarulus striatulus) in Vietnam but with no record of with more than forty species parasitizing aquatic the final host. Nguyen Thi Le (1991) found N. intesti- birds, and a few species also described from T nalis (Tubangui, 1932) in the domestic chicken, Gallus mammals. Of the latter group, N. neyrai Castro, 1945 domesticus. Adam et al. (1993) studied Notocotylus was reported from Arvicola sapidus Miller, 1908 in sp. lophocercous cercariae from the mollusc Bithynia Europe (Feliu et al., 1986), N. fosteri Kinsella & Tkach, siamensis goniomphalus (Prosobranchia: Bithyniidae) 2005 from the rice rat Oryzomys palustris (Harlan, in Thailand. Finally, Eduardo & Gaddi (2003) reported 1937) in Florida, and N. urbanensis (Cort, 1914) from new records of Notocotylus spp. from wild birds Ondatra zibethicus (Linnaeus, 1766) in Nebraska. In in the Philippines: N. intestinalis from the greater Australia, N. johnstoni Cribb, 1991 and N. imbricatus painted-snipe Rostratula benghalensis benghalensis, (Looss, 1893) were reported from the Australian water Notocotylus pacifer (Noble, 1933) from the common rat Hydromys chyrsogaster Geoffroy, 1804 (Cribb, moorhen Gallinula chloropus lozanoi and N. navi- 1991). In China, Notocotylus ratti (Yie et al., 1956) was formis (Tubangui, 1932) from the whistling-duck described from Rattus rattus alexandrinus (Geoffroy, Dendrocygna arcuata arcuata. Knowledge on adult 1830). All species of this genus are associated with Notocotylus from mammals in Southeast Asia is limited wetland habitats as emphasized by Kinsella & Tkach to Pham et al. (2001), who reported an unspecified (2005), where the life cycle involves aquatic gastro- member of the genus from two rodent species: the rice pods as intermediate hosts (Thi Le, 1986). field rat Rattus argentiventer (Robinson & Kloss, 1916) and the lesser rice field rat Rattus losea (Swinhoe, * Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand, & Department of Zoology, 1871) captured in Bac Ninh Province (Vietnam). To Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand. our knowledge, there are no reports of Notocotylus ** Institut des Sciences de l’Evolution, UMR 5554 CNRS-IRD-UM2, identified to species from mammals in Southeast Asia. CC65, Université de Montpellier 2, 34095 Montpellier, France, & CIRAD, UR22 AGIRs, Campus International de Baillarguet, 34398 The lesser rice field rat (R. losea) is widely distributed Montpellier, France. from Taiwan, Hainan, and Fukien in China to Vietnam, *** Department of Population Biology, Institute of Vertebrate Laos PDR and Thailand (Marshall, 1988). This rodent is Biology, 16 Academy of Sciences of the Czech Republic, 675 02 mainly found in rice fields and other cultivated land, Konesin, Studenec 17 122, Czech Republic. Correspondence: Alexis Ribas. where it burrows into the ground, but it has also been E-mail: [email protected] found in grassy areas in natural pine forests at 850 m Parasite, 2011, 18, 35-38 Original contribution 35 CHAISIRI K., MORAND S. & RIBAS A. in Thailand and in coastal mangrove forest (Marshall, DESCRIPTION 1988 cited by Corbet & Hill, 1992). In the course of Notocotylinae Kossack, 1911. Based on holotype the CERoPath project, rodents were captured in Loei and five paratypes mounted in toto with charac- Province, in the northeast of Thailand on February ters of genus. Body 2,112 (1,678-2,461) long and 2008. A species of Notocotylus that did not match any 770 (834-659) maximum width at about level of described species was recovered from R. losea. ovary. Tegument unspined. Total number of ventral papillae 27-31; lateral and medial rows all contain 9- MATERIALS AND METHODS 11 papillae (usually 9-10). Second papilla of middle row at same level as first papilla of lateral rows (see Fig. 2). Cercarial eye-spot pigment scattered in fore- odents were trapped in Loei province (Latitude: body. Oral sucker 124.28 (130.56-110.8) long, 160.43 17°, 490219; Longitude: 101°, 688536), Thailand, (166.4-151.04) wide. Oesophagus 234 (267-154) long, in 2008. Rats were collected near fresh water R bifurcating into two caeca, which curve between habitats in lowland paddy fields and soybean fields. ovary and testes, and terminate blindly 103.0 (43.52- These habitats were closely located by the branch of 151.04) or 4.90 % (1.78-7.27 %) of body length from irrigation system and approximately one kilometer far posterior end of body, anterior or posterior to end from main river. Rodents were dissected after capture of testes. Testes opposite, deeply lobed, longer than and their guts isolated and preserved in alcohol for broad 415 (298-494) long, 219 (164-267) wide. Cirrus future dissection at the laboratory. sac median, straight, 722 (607-803) long, broad pos- Intestinal tracts of 88 R. losea were examined for hel- teriorly and sharply narrowed anteriorly, containing minths. Trematodes were isolated and preserved in saccular internal seminal vesicle and pars prostatica. alcohol, and later were post-fixed in Bouin’s solution, Cirrus not everted in available specimens. Common stained in Semichon’s acetocarmine and mounted in genital pore ventro-medial, considerably in front of Canada balsam. Some unstained specimens were also intestinal bifurcation reaching posterior margin or mounted in Canada balsam, and several specimens overlaying oral sucker ventral to beginning of oeso- were dissected to study the eggs. Measurements are in phagus. Ovary median, between testes, never entire, micrometres and are listed as the holotype, followed bilobed posteriorly, 188 (144-236) long, 107 (82-144) by the range of the paratypes and the mean of five wide. Vitelline reservoir immediately anterior to ovary. paratypes in parentheses. Drawings were made with Vitellarium formed of two lateral groups of 11-16 the aid of a camera lucida. bilobed to multilobed follicles extending from 23.12- 27.13 (24.76) % of body length from posterior end to 44.85-66.22 (50.60) % of body length from anterior DESCRIPTION end. Uterus extending anteriorly from ovary in 12-15 major, laterally directed coils, with 2-4 coils anterior to NOTOCOTYLUS LOEIENSIS N. SP. (Figs 1-4) vitelline follicles; some uterine coils slightly exceeding caeca but are contained by vitelline follicles. Metraterm ype host: lesser rice field rat, Rattus losea muscular, sinistral at level of cirrus pouch (see Fig. 4). (Swinhoe, 1871) (Rodentia: Muridae). Eggs operculate bearing single long, filament at each TSite: cecum. pole; egg capsule length 16-19 (18) and 10-11 (10) Type locality: Muang District, Loei Province, Thailand. wide (n = 20), each filament of variable size 29-76 (44) (Latitude: 17°, 490219; Longitude: 101°, 688536). long. Excretory pore opening dorsally at about level of posterior end of testes; excretory vesicle saccular. Type specimens: type specimens were deposited in the Museu de Ciències Naturals de Barcelona (Bar- celona Natural Science Museum, Catalonia, Spain), DISCUSSION codes of holotype MZB 2009-3134,and five paratypes MZB 2009-3135 to 2009-3139. Additional individuals are deposited in the “Southeast Asia small mammals insella & Tkach (2005) considered 49 species helminth collection” in the Laboratory of Parasitology of the genus Notocotylus to be valid. To this of the University of Barcelona (Spain). Knumber should be added N. biomphalariae (Flores & Brughi, 2005). The species N. gippyensis and Collection dates: February 2008. N. tadornae should be removed from this list, as these Prevalence and intensity of infection: prevalence of two have only one row of ventral papillae and thus 9.1% (8 of 88). Intensity 2-20 (mean 82.5). must be transferred to the genus Uniserialis according Etymology: this species is named for the Loei Province, to Barton & Blair (2005). The number is then reduced where this trematode was collected. to 48 valid species. Parasite, 2011, 18, 35-38 36
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